Sewing machine having an automatic lower thread tension device

Details Sewing machine having an automatic lower thread tension device Sewing machine having an automatic lower thread tension device

1986-05-20

1987-10-20

Nerbun, Peter

Sewing

Elements

Tensioning

112229, D05B 6300, D05B 4704

Patent

active

047006447

ABSTRACT:
When a lower thread is effected with tension by an upper thread, a lower thread tension device is actuated in a certain working distance with very small resistance to an extent that a lower thread is drawn as if without resistance. If the lower thread is effected with said tension outside of said distance, it is not drawn out with large resistance. An actuation means successively receives information about thread consumed in each of the stitches and information about rotation phase of the sewing machine from a phase sensor. In the distance of a strong resistance, the lower thread is prohibited from drawing, and the thread is tightened in this distance.

REFERENCES:
patent: 4215641 (1980-08-01), Dobrjanskyj et al.
patent: 4301757 (1981-11-01), Tonomura
patent: 4377980 (1983-03-01), Hanyu et al.
patent: 4632048 (1986-12-01), Matsubara
patent: 4638751 (1987-01-01), Hanyu et al.

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